1. Department of Radiology; Ajou University School of Medicine; Suwon Republic of Korea
2. Department of Radiology; Institute of Gastroenterology; Research Institute of Radiological Science; Yonsei University Health System; Seoul Republic of Korea
3. Department of Pathology; Yonsei University Health System; Seoul Republic of Korea
4. Department of Surgery; Yonsei University Health System; Seoul Republic of Korea
5. Department of Internal Medicine; Yonsei University College of medicine; Seoul Republic of Korea
6. Department of Radiology; Seoul St. Mary's Hospital; The Catholic University of Korea; Seoul Republic of Korea